[SQUASH] Use HyperStrategyMixin as part of IStrategy interface.

freqtrade/strategy/interface.py

@@ -18,6 +18,7 @@ from freqtrade.exceptions import OperationalException, StrategyError
 from freqtrade.exchange import timeframe_to_minutes, timeframe_to_seconds
 from freqtrade.exchange.exchange import timeframe_to_next_date
 from freqtrade.persistence import PairLocks, Trade
+from freqtrade.strategy.hyper import HyperStrategyMixin
 from freqtrade.strategy.strategy_wrapper import strategy_safe_wrapper
 from freqtrade.wallets import Wallets
 
@@ -59,7 +60,7 @@ class SellCheckTuple(NamedTuple):
     sell_type: SellType
 
 
-class IStrategy(ABC):
+class IStrategy(ABC, HyperStrategyMixin):
     """
     Interface for freqtrade strategies
     Defines the mandatory structure must follow any custom strategies